package day07;

import java.util.Random;
import java.util.Scanner;

//验证码生成？位（大写字母、小写字母、数字）
public class VerificationCode {
    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);

        String code=generateVericode(6);
        System.out.println("验证码为："+code);
    }
    public static String generateVericode(int len){
        String code="";
        char[] chs={'a','b','c','d','e','f','g','h','i','j','k','l','m',
                'n','o','p','q','r','s','t','u','v','w','x','y','z','A',
                'B','C','D','E','F','G','H','I','J','K','L','M','N','O',
                'P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2',
                '3','4','5','6','7','8','9','达','内'};
        Random rand=new Random();
        for(int i=1;i<=len;i++){
            //int index=(int)(Math.random()*chs.length);//随机下标0~61
            int index=rand.nextInt(chs.length);
            code+=chs[index];//获取随机字符并拼接到code中
        }


        return code;
    }
}
